Exhaust Nut 50mm - BMW Airhead; 18 21 1 234 721 / EnDuraLast
Exhaust Nut 50mm - BMW Airhead; 18 21 1 234 721 / EnDuraLast
Exhaust Nut 50mm - BMW Airhead; 18 21 1 234 721 / EnDuraLast
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Exhaust Nut 50mm - BMW Airhead; 18 21 1 234 721 / EnDuraLast

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New Aluminum 50mm Exhaust Nut for 38mm headers - purchase two for a matching set. Vehicle Manufacturer: BMW Application: BMW Airhead Models Make / Model: BMW R60, R75, R80, R100 Model Years: 1976 - 1995 Manufacturer Part # 18 21 1 234 721

(See APPLICATION TABLE tab BELOW to verify vehicle fitment)
Replace your old worn or damaged exhaust nuts with a classy new looking part!

Use an exhaust nut wrench to loosen and tighten these nuts otherwise you may damage the fins - see Part No EXNut-Wrench758

Do NOT install new nut without first applying copper (not silver) anti-seize on the thread - see our Part No:
LOC8008.
NOTE: Exhaust nuts must be spun off every 10,000 miles during a major service for application of antiseize.

When struggling to remove seized nuts, heat them up to 300degF to loosen them.

In extreme cases you may have to cut the nut off being careful not to damaged the thread on the cylinder head.The nut can be cut off with a hack saw or dremel. Cut the nut and only saw down "to the threads" of the head. Now hit a chisel in the cut to try separate the two pieces. If this does not work, then make a second cut on the opposite side of the and use the chisel to separate the nut from the cylinder head.
Installation Tips - Courtesy Brook Reams
EME Part Number: EXNut721
BMW Part Number: 18 21 1 234 721
Model Year
A10 (259O) 09/87-01/96 ECE
R60 TIC (2477) 09/78-11/82 ECE
R60/7 (2477) 07/76-11/77 USA
R60/7 (2477) 05/76-04/80 ECE
R75/7 (2477) 07/76-06/77 USA
R75/7 (2477) 05/76-01/79 ECE
R80 85-87 (2472) 07/84-07/87 USA
R80 (2472) 03/84-01/95 ECE
R80 (2477) 04/77-11/84 ECE
R80 (2477) 04/77-07/80 USA
R80G/S (2471) 06/80-03/87 USA
R80GS PD (47E1) 06/90-07/90 ECE
R80GS PD (47E2) 08/90-06/95 ECE
R80GS (2471) 05/80-07/87 ECE
R80GS (47E1) 01/87-07/90 ECE
R80GS (47E2) 04/90-10/95 ECE
R80GS (47E3) 01/96-12/96 ECE
R80R Mystik (2473) 03/94-03/95 ECE
R80R (2473) 03/91-06/94 ECE
R80RT 85-87 (2472) 07/84-04/87 USA
R80RT (2472) 07/84-12/95 ECE
R80RT (2477) 06/82-11/84 ECE
R80RT (2477) 08/82-10/84 USA
R80ST (2471) 10/82-10/84 USA
R80ST (2471) 04/82-10/84 ECE
R80TIC (2477) 06/78-01/85 ECE
R100/7 (2474) 05/76-06/77 ECE
R100/7T (2474) 05/76-07/78 USA
R100/7T (2474) 04/77-10/84 ECE
R100/T (2474) 09/78-09/84 USA
R100CS (2474) 06/80-10/84 ECE
R100CS (2474) 09/80-09/84 USA
R100GS 91-95 (47E2) 11/90-09/94 USA
R100GS PD 91-95 (47E2) 09/90-12/95 USA
R100GS PD (47E1) 02/89-07/90 ECE
R100GS PD (47E1) 06/89-04/90 USA
R100GS PD (47E2) 08/90-02/96 ECE
R100GS (47E1) 12/86-07/90 ECE
R100GS (47E1) 01/87-03/90 USA
R100GS (47E2) 04/90-07/94 ECE
R100R Mystik (2473) 03/94-09/95 USA
R100R Mystik (2473) 12/93-01/96 ECE
R100R (2473) 03/91-12/95 ECE
R100R (2473) 09/91-12/95 USA
R100RS 77-84 (2474) 05/76-10/84 USA
R100RS 88-93 (2478) 08/87-08/92 USA
R100RS (2474) 03/76-11/84 ECE
R100RS (2478) 07/86-10/92 ECE
R100RT 79-84 (2474) 04/78-09/84 USA
R100RT 88-95 (2478) 08/87-12/95 USA
R100RT (2474) 06/78-10/84 ECE
R100RT (2478) 07/87-12/95 ECE
R100S (2474) 05/76-07/80 ECE
R100S (2474) 05/76-07/80 USA
R100TIC (2474) 11/80-09/84 ECE

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